My '84 John Deere 316 originally came with an Onan B43E. After going through a lot of the external stuff with the engine, and getting it running, a consistent metallic colored oil and a rod-knock that appeared once warm and worsened with temp -- I decided to do a motor swap with another John Deere. An '87 316 gave up it's Onan P218G and I swapped it into my '84. The P218G runs good, but I am having governor issues. I have had the engine in and out three or four times now to address a leaking oil pan and essentially re-gasketing everything except the front and rear covers. I am now having a condition where when I throttle up and am running at high-speeds, the governor will mess up and throw the throttle to WOT -- effectively choking the engine out and stalling it. I have read up on the fixes for this, and while this 800hr Onan will definitely be worthy at some point for another round of "pull-er-out and go-thru it-again", I have elected to call it quits for now. I bought a house and am closing in the coming weeks, and I have a model 49 blower to go on my 316. In essence of wanting to be good and prepared for the coming lake effect snow, and no garage to work in (I count sunny and mild days as blessings for my projects), I dropped the cash and ordered a brand-new Briggs 18HP Vanguard + Kit from Small Engine Warehouse to drop into my 316. From the reading I've done, the reliability and history of these engines is in a league of it's own. Break-in wise, I believe I'll drain the oil at 2 hours and install a new filter. I am planning on 5W-40 for this thing. Briggs says SAE30 or 5/10W-30 for colder climates. Then they also recommend 15W-50 for consistent commercial use (running all day). I am thinking the T6 5W-4 will be a good choice. Any other recommendations on a break-in plan? My goal will then be to go through the Onan P218G and re-do the '87 316 for Dad's summer mowing (whenever he wants to retire one of the 90's Craftsmans with the vertical shaft Kohler Command). I figure, if these Vanguards are as good as they say they are, I should be setting myself up for a good 15-20 year run, especially knowing my strict maintenance.